\begin{document}$ {\Lambda_c^+}\to {pK^-\pi^+} $\end{document} decay is suggested as a spin polarimeter. A general description of the decay is developed using Euler angles, and the polarization parameters are derived. Its relationship with parity violation is found using the phenomenological amplitude model. A Monte-Carlo simulation is performed, and the results show that charmed baryon polarization is well determined using a set of Monte-Carlo events with selected asymmetry parameters. The experimental measurement of these asymmetry parameters is suggested."> Using <inline-formula><tex-math id="M1">\begin{document}${\boldsymbol {\Lambda_c^+}\boldsymbol\to\boldsymbol{pK^{-}\pi^+}} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/a3b761fb-e59d-4f9d-9df8-24fa6abe5255/CPC-2021-0431_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/a3b761fb-e59d-4f9d-9df8-24fa6abe5255/CPC-2021-0431_M1.png"/></alternatives></inline-formula> as a spin polarimeter -
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